Method and device for correcting geometric distortion of character lines
A technology of geometric distortion and correction method, which is applied in the field of optical character recognition, can solve problems such as character deformation, poor smearing effect, and poor correction effect, and achieve the effects of correcting distortion, good adaptability, and good correction effect
Active Publication Date: 2011-05-18
HANVON CORP
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This method has the following three deficiencies: the first is that there is no block type distinction processing for the text line, and its processing effect on the text line composed of square characters is acceptable, but the correction effect on the text line composed of non-square characters is poor; the second is This method uses the global threshold value for run-length smearing, but generally there is no reasonable global threshold value, so the smearing effect is poor and the correction effect is poor. Case
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[0065] In order to understand the technical content of the present invention more clearly, the following two embodiments are given in detail.
[0066] One of the examples
[0067] The invention discloses a method and a device for correcting geometric distortion of character lines. First, obtain the text line in the binary image and select the text line as the calibration reference, then judge the block type of the reference text line, and then use the segmented run smearing algorithm to smear the reference text line image according to the block type, and then Smear the image and calculate the correction curve according to the set of sampling points, and finally sample along the normal direction of the correction curve in the distorted image as the pixel column of the corrected image, so as to complete the correction of the geometrically distorted image of the text line.
[0068] Such as figure 1 As shown, it is the first embodiment that the block type acquired by the scann...
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The invention discloses a method and device for correcting geometric distortion of character lines, belonging to the field of optical character recognition. The method comprises the following steps: extracting each character line in a binary image; selecting a reference character line according to the extracted character lines; judging the block type of the reference character line, and darkeningthe reference character line by section according to the block type; sampling the darkened reference character line and then fitting a correction curve; and correcting the binary image according to the correction curve. According to the invention, differential processing is performed according to the block type of the character line, and a good correction effect is realized for the geometric distortion images of character lines in multiple languages; the sectional run darkening technology is adopted for implementing the run darkening, accurate correction curve can be obtained, and the correction effect is good; the method is suitable for correcting the character section with different distortions in each character line, and has good adaptability; and as the pixel array of the corrected image is obtained by sampling along the normal direction of each point on the correction curve, the character distortion can be effectively corrected.
Description
[0001] technical field [0002] The invention belongs to the field of optical character recognition, in particular to a method and device for correcting geometric distortion of character lines. [0003] Background technique [0004] Electronic scanning pen (referred to as scanning pen) is one of the important applications of OCR. The technical principle of the scanning pen is: the optical camera continuously takes pictures of the scanned data according to a certain frequency, obtains the image sequence of the scanned data, stitches the image sequence into a panoramic image and performs OCR processing. During the scanning process, due to the axial rotation of the scanning pen, the text lines in the obtained panoramic image will be inclined or even bent, which will affect the subsequent OCR recognition. Therefore, after the panoramic image is obtained, geometric distortion correction needs to be performed on it first, and the text lines therein are corrected to be horizontal...
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Inventor 李永彬
Owner HANVON CORP